What was found
FLT#1463, LAX-CUN. (AIRCRAFT PERFORMED AN AIR TURN ABCK TO LAX) 'DURING CLIMB THROUGH 15000 FEET NOTICEABLE CABIN PRESSURE FLUCTUATION OCCURRED WITH SIMULTANEOUS ECAM " CAB PRESS SYS 1 FAULT" CAB PRESS V/S FLUCTUATIONS CONTINUED VARYING BETWEEN -1900 TO + 1000. AIR RETURN TO LAX; REF L/P 3358463-1(REMOVED AND REPLACED CABIN PRESSURE CONTROLLER 1 PER AMM 21-31-34 BITE TEST PASSED. OPS CHECK GOOD) FOR CORRECTIVE ACTION. PERFORMED PRESSURIZATION TEST PER AMM 05-53-00-780-003-A01. PRESSURIZED TO 6.0 PSI OBSERVED NO FLUCTUATIONS IN CAB PRESS V/S. ALL INDICATIONS ARE NORMAL. NO DEFECTS NOTED AT THIS TIME.'